# SDR ASAA2015100713387

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: October 7, 2015
- Submitted: October 12, 2015
- Operation: Air carrier
- Aircraft: [N583AS](https://openairdocs.org/aircraft/N583AS), registered now
- Make and model: Boeing 737890
- Aircraft serial: 35681
- Aircraft time: 31,553 hours, 9,349 cycles
- System (JASC): [2160 · Cabin Temperature Control System](https://openairdocs.org/jasc/2160)
- Part: Control Valve
- Part number: 3989084
- Part serial: 11542
- Condition: Failed
- Location: A/C Bay
- Part time: 23,946 hours, 7,467 cycles
- Stage of operation: TX
- How discovered: O
- Nature of condition: J
- Precautionary procedure: O
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/ASAA2015100713387

## Discrepancy

FWD CABIN ZONE TEMP LIGHT ILLUMINATED ON PUSHING MASTER CAUTION RECALL BUTTON, LIGHT  EXTINGUISHED WHEN PRESSING MASTER CAUTION RESET BUTTON.  ACFT GROUNDED.  WHILE ON DEFERRAL, UNABLE TO MAKE FWD/AFT CABIN CONTROL ADJUST TEMP.  R & R THE FWD TRIM MODULATING VALVE REF AMM 21-51-10.  INSPECTED CABIN SENSORS, R & R ALL FILTERS AS WELL.  
AS CLEANED, BOTH FWD & AFT GALLEY VENTILATION GRILLS.

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